This small North American gull breeds in northern forests in summer and winters farther south along coasts, lakes, and rivers.
Adult birds have a black head and red legs in summer, and a grey patch near the ear in winter. Their wings show a white wedge.
It plucks small fish from the water and catches flying insects. Unusually for a gull, it nests in trees in its northern breeding range.
An extinction-risk assessment has not been added yet.